Question

Give the correct order of initials $T$ or $F$ for the following statements. Use $T$ if statement is true and $F$ if it is false.
(I) Every mineral is an ore but every ore is not a mineral.
(II) Slag is product formed during extraction of metal by combination of flux and impurities.
(III) Highly pure metals can be obtained by zone refining.
(IV) Carnallite is an ore of magnesium and sodium.

• A. $TTTF$
• B. $FTTF$
• C. $FTTT$
• D. $TFTF$

Answer 1

Answer: (B)

$FTTF$

(A) Those minerals which contains high percentage of the metal and from which it it profitable to extract the the metal are known as ores. All ores are minerals but all minerals are not ores.
Thus, option A is false
(B) Slag is a waste product formed during extraction of metal by combination of flux and impurities. It is formed during the extraction of metals by smelting process.
Thus, option B is true.
(C) Highly pure metals can be obtained by zone refining. By using this method, purity of 99.999% is obtained.
Thus, option C is true.
(D) Carnallite is $MgC{l}_2.KCl.6H_{2}O$.
Thus, option D is false.